package com.th.campusmatchbackend.job;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.th.campusmatchbackend.model.domain.User;
import com.th.campusmatchbackend.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

@Slf4j
@Component
public class PreCacheJob {
    @Resource
    private UserService userService;
    @Resource
    private RedisTemplate<String,Object> redisTemplate;
    @Resource
    private  RedissonClient  redissonClient;
    // 重点用户
    private List<Long> mainUserList = Arrays.asList(1L);


    //每天执行，预热推荐用户
    @Scheduled(cron = "0 32 21 * * *")
    private void doCacheRecommendUser() {
        RLock lock = redissonClient.getLock("gggggle:precachejob:docache:lock");
        try {
            // 只有一个线程能获取到锁
            if(lock.tryLock(0,-1,TimeUnit.MILLISECONDS)){
                System.out.println("getLock: " + Thread.currentThread().getId());
                System.out.println("getLock: " + Thread.currentThread().getName());
                //查数据库
                QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                Page<User> userPage = userService.page(new Page<>(1,20),queryWrapper);
                String redisKey = String.format("taohahu:user:recommendUsers:%s",mainUserList);
                ValueOperations<String, Object> valueOperations = redisTemplate.opsForValue();
                //写缓存,30s过期
                try {
                    valueOperations.set(redisKey,userPage,30000, TimeUnit.MILLISECONDS);
                } catch (Exception e){
                    log.error("redis set key error",e);
                }

            }
        } catch (InterruptedException e) {
            log.error("doCacheRecommendUser error",e);
        }finally {
            // 只能释放自己的锁
            if (lock.isHeldByCurrentThread()) {
                System.out.println("unLock: " + Thread.currentThread().getId());
                System.out.println("unLock: " + Thread.currentThread().getName());
                lock.unlock();
            }

        }





    }

}
